Apparatus for producing perforated sheets of wood-pulp.



N0. 720593. PATEN TED -FEkflj, 1903..

A G. S.LIN4DBER G. A APPARATUS FOR PRODUCING PERFORATED SHEETSOF WOODIULP.

APPLICATION FILED APR. 26, 1901.

m MODEL.

Win Waco zr PATENTED FEB. 1, 1903. P I G. s. LINDBERG. APPARATUS FOR PRODUCING PBRFORATED. SHEETS 0P WOOD PULP,

no 116mm.

APPLIOATION FILED APR. 26 1901.

m: uonms PETaRS 120.. PHOTO'LITFQ, WASHINGTON. o, 04

PATENT 'QFFICE.

GUSTAF SAMUEL LINDBERG,

OF GOTHENBURG, SWEDEN.

APPARATUS FOR PRODUCING PERFORATED SHEETS OF WO0DPULP.

SPECIFICATION forming part of Letters Patent NO. 720,593, dated February 17, 1903.

Application filed April 26, 1901.

To all whom it may concern:

Be it known that I, GUSTAF SAMUEL LIND- BERG, a subject of the King of Sweden and Norway, and a resident of Gothenburg, in the Kingdom of Sweden, have invented certain new and useful Improvements in Apparatus for Producing Perforated Sheets of Wood- Pulp, of which the following is a full, clear, and exact description.

This invention relates particularly to an apparatus or device for producing perforated sheets of Wood-pulp directly in apaper-making machine. The object of the perforations may be partly to satisfy provisions in the custom-house regulations of some countries that only perforated wood-pulp will be admitted free of duty or draw but slight duty and partly to form a trade-mark, designate a firm-name, or the like.

In carrying out the invention the woodpulp is deposited on the take-up roller and is subjected to the piercing action of air or water jets determined by apertures in the said roller and acting on the pulp when passing in its damp state from the felt to the takeup roller. This continues until the pulp collected on the take-up roller has obtained sufficient thickness, it being then cut open in usual manner and removed from the roller. The refuse or waste produced in the piercing or perforating operation is carried along by the felt and taken from the latter by a special roll, from which it is removed by means of a scraper, brush, or the like. The take-up roller is perforated to conform to the desired perforations of the pulp sheet, and within the roller near its periphery are located tubes, which are perforated at the side adjoining the shellof the roller with a longitudinal row of holes corresponding with those in the take-up roller. Into the pipes is forced air or water, which when a row of holes in the take-up roller is brought opposite the holes in the pipe blows away the thin and moist pulp layer covering the former holes.

In the drawings, Figure l is an end view of the apparatus, partly in section; and Fig. 2 is a side view, partly in section.

The felt 1 receives the pulp from the making-cylinder 3, located in the reservoir 2, and delivers it in usual manner to the take-up Serial No. 57,526. (No model.)

From the pipe 6 project downward four pipes,

two of which, 7, are joined to and support a tube 8, located at the lowest point within the roller opposite the guide-roller 16. The tube 8 is quite close to the shell of the guide-roller and is provided on the side adjoining the roller with a row of holes 9, corresponding to those in the roller 4. (See Fig. 1.) The two other pipes 10 lead to and sustain another tube 11, located within the roller 4, said tube resembling the tube 8, but being situated at some little distance from the latter in the direction of rotation of the roller. This tube 11 is also provided with perforations 9, similar to those in tube 8. The tube 6 communicates through a pipe 12 with some main pipe common to several machines, said main pipe issuing from the pump, blowingengine, or the like, by means of which the liquid or air pressure is produced. The pipe 12 has at 18 a joint where the lower end of the vertical portion 6 of pipe 6 is inserted, so as to allow the pipe to lengthen or shorten and accordingly the roller 4 to rise or descend freely. In contact with the felt at the roller 16 is, moreover, located a roller 13, past which the felt moves shortly after being in contact with roller 4. The roller 13 is journaled on sliding bars 14, arranged so as to allow of the roller being pressed by means of them against the felt and caused to take up pulp from the latter. On the roller 13 bears a scraper 15 or the like. According as the perforations of the roller 4 in the rotation of the latter arrive opposite the holes of the tube 8 the wood-pulp deposited over the perforations of the take-up roller is blown back to the felt, or the pulp is prevented from depositing over the perforations of the take-up roller, depending on whether the pulp has begun to be lifted by the takeup roller from the felt or not which again depends on the position of the tube 8, which may be slightly to the right of the line passing through the center of the two rollers 4c 10, but preferably should just coincide with said line, as shown in Fig. 2. As the blowing is repeated after the pulp is deposited on the roller 4 the sheet of pulp when OOH]- pleted will be provided with holes having quite a clearly-defined edge or outline. As a consequence smaller perforations arranged to form a trade-mark or the like may likewise be produced in the manner described, the take-up roller being in this case provided with perforations to correspond. The tube 11 serves to blow away any pulp which may have chanced to remain in the apertures of the roller 4, so as to keep the latter apertures perfectly clean. The pulp caused by the perforating device to remain on the felt is taken up by the roller 13, bearing yieldingly on the latter. The scraping iron or knife 15, in place of which may be substituted a brush or the like, removes the pulp from roller 13, which pulp drops into the box 10, which is emptied into the reservoir 2 when required.

Should it be desired at times to make unperforated sheets of pulp, the apertures of the roller 4 are closed up by plugs especially provided for the purpose and arranged to be readily removed or inserted, as required. In manufacturing unperforated sheets the air or liquid conduit 12 is shut off and the roller 13 and box 10 are removed.

By perforating the wood-pulp directly in the machine in the manner described the outlay for a special machine for the purpose is avoided and the labor and waste of pulp are saved which have hitherto been caused by the practice of carrying out the perforating process in a special operation independent of the paper-machine.

Having now described myinvention, whatI claim as new, and desire to secure by Letters Patent, is

1. The combination with a take-up roller of a paper-making machine, of means arranged to direct a fiuid through the moist layer of pulp at the moment when the latter is being taken up by said roller, whereby to form perforations in the pulp, as described.

2. The combination with a take-up roller of a paper-making machine, of means arranged within said roller adapted to direct a fluid through the moist layer of pulp at the mo ment when the latter is being taken up by said roller.

3. The combination with a perforated takeup rollerof a paper-making machine,of means arranged to direct a fluid through perforations in said roller and through the moist pulp at the moment when the latter is being taken up by the roller, and means arranged to direct a fluid through the perforations of the take-up roller to clear the latter of any portions of pulp remaining in said perforations after the perforations have been formed in the sheet of pulp.

4. The combination with a perforated takeup roller of a paper-making machine, of a pipe arranged within the roller and provided with perforations adapted to aline with the perforations in said roller as and for the purpose specified.

5. The combination with a perforated takeup roller of a paper-making machine, of a pipe arranged within the roller and provided with perforations adapted to aline with the perforations in said roller, and a second pipe arranged within the roller and removed from the first pipe in the direction of the rotation of the roller and being provided with perforations adapted to aline with the perforations in the roller.

6. The combination with a perforated takeup roller of a paper-making machine, of a supply-pipe for a fluid extending Within the roller, radial branch pipes, longitudinal pipes connected thereto and lying adjacent to the perforations in the take-up roller and being provided with perforations adapted to aline with the perforations in the take-up roller.

7. The combination with a perforated takeup roller of a paper-making machine, the roller 16 and the felt adapted to pass between the take-up roller and roller 16 and to pass around the latter roller, of a roller 13 arranged relatively to the roller16 to bear upon the felt passing around the latter and a scraping device adapted to remove portions of pulp adhering to the roller 13.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

GUSTAF SAMUEL LINDBERG.

Witnesses:

CARL A. WALLER, J. W. LArsTAn'r. 

